Unique self‐assembled macrocyclic multinuclear ZnII and NiII complexes with binaphthyl‐bipyridyl ligands (L) were synthesized. X‐ray analysis revealed that these complexes consisted of an outer ring (Zn3L3 or Ni3L3) and an inner core (Zn2 or Ni). In the ZnII complex, the inner Zn2 part rotated rapidly inside the outer ring in solution on an NMR timescale. These complexes exhibited dual catalytic activities for CO2 fixations: synthesis of cyclic carbonates from epoxides and CO2 and temperature‐switched N‐formylation/N‐methylation of amines with CO2 and hydrosilane.

Recent progress in homogeneous catalysis with macrocyclic multinuclear metal complexes (categories A–C) is overviewed.

Schiff-base derivatives are widely used organic compounds and their metal complexes have been drawing much attention to chemists due to interesting structural features and unique properties. The presence of nitrogen containing imine groups (À C=NÀ ) in Schiff-bases as well as in their metallic complexes and the chelating properties of these compounds are responsible for their many unique biological properties. In this review, we have summarized various acyclic Schiff-base ligands and their different metallic complexes which have been reported in the last one decade. Schiff-bases and their metal complexes have shown a broad range of biological activities, including antifungal, antibacterial, antimalarial, antiproliferative, antiinflammatory, antiviral, and antipyretic properties. We have reviewed and arranged the reported Schiff-base derivatives according to their diverse biological applications, especially their anti-bacterial and anti-fungal activities, anti-tumor and anti-cancer activities, anti-oxidant activities, anti-inflammatory activities and other therapeutic and medicinal properties. The other component of this work as a review of the molecular structures of various Schiff-bases since their molecular structures play a primary role in the biological properties. The presence of heteroatoms such as nitrogen, sulfur and oxygen with free electron pairs and aromatic rings in the structure of the Schiff-bases play significant roles in determining their properties.

Unique self-assembled macrocyclic multinuclear Zn II and Ni II complexes with binaphthyl-bipyridyl ligands (L) were synthesized.X-ray analysis revealed that these complexes consisted of an outer ring (Zn 3 L 3 or Ni 3 L 3 )and an inner core (Zn 2 or Ni). In the Zn II complex, the inner Zn 2 part rotated rapidly inside the outer ring in solution on an NMR timescale. These complexes exhibited dual catalytic activities for CO 2 fixations:s ynthesis of cyclic carbonates from epoxides and CO 2 and temperature-switched N-formylation/N-methylation of amines with CO 2 and hydrosilane.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Alcohol-based hand sanitizers (ABHSs) containing ethanol (EtOH) or isopropyl alcohol (IPA) to inactivate microorganisms help prevent the spread of respiratory diseases. These products have become very popular during the COVID-19 pandemic. Apart from vaccines or other preventative antiseptic measures, the majority of consumers have relied on different types of ABHSs to disinfect their hands. As a result, there has been a global rush in the demand for these ABHSs and other antiseptic hygiene products. This has resulted in the formation of many new commercial sanitizer producers. There are around fifty companies of varying sizes that have been marketing their ABHSs in Bangladesh, most of which have only been manufacturing their products for the first time since the COVID-19 pandemic. To monitor the quality and components of these products, the Bangladesh Council of Scientific and Industrial Research (BCSIR) analyzed approximately 200 different hand sanitizer samples using GC-FID method. All samples were alcohol-based except for 3 which were alcohol-free aqueous hand sanitizers. Of the supplied formulated ABHSs, 80 samples were found to contain only IPA and 54 contained only EtOH. However, 28 samples were found to be contaminated with methanol (MeOH), 7 samples contained only MeOH and 18 samples contained both EtOH and IPA. This is the first study to explore the analysis of alcohol content in formulated ABHSs and their marketing status in Bangladesh, but the findings could be of use in other jurisdictions as similar issues have been raised in many parts of the world.